For sale to Mono-san. Pirastro Eudoxa cello strings, C and G strings. - Brand: PIRASTRO - Model: Eudoxa Cello G - Size: 24 PM - Model: Eudoxa Cello C - Size: 21 PM Thank you for looking. Although new and unused, they are about 30 years old since purchase. As you can see in the photos, there is no rust.